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Step 22.Reinstall the A20 IF Multiplexer Board
For instructions, click the Chapter 7 bookmark "Removing and Replacing the A20 IF Multiplexer
Board" in the PDF Service Guide
Step 23.Reinstall the A19 Test Set Motherboard
1. For instructions on reinstalling the board, click the Chapter 7 bookmark "Removing and
Replacing the A19 Test Set Motherboard" in the PDF Service Guide
2. Install the following new ribbon cables and wire harness in the order listed. To see an image
showing their locations, click the Chapter 6 bookmark "Bottom Ribbon Cables and Wire
Harnesses, 4-Port, Option 423 (including Option 029)" in the PDF Service Guide
are listed in
Table 1 on page
— Ribbon cable, N5242-60006 from J213 to A24 mixer brick 2
— Ribbon cable (part of bias tee assembly), port 3 bias tee to A19 test set motherboard J543
— Ribbon cable (part of bias tee assembly), port 4 bias tee to A19 test set motherboard J544
— Ribbon cable (8121-0982), A19 test set motherboard J206 to A43 port 3 receiver attenuator
— Ribbon cable (8121-0982), A19 test set motherboard J207 to A44 port 4 receiver attenuator
— Ribbon cable (N5242-60008), A19 test set motherboard J202 to A35 port 3 source
attenuator
— Ribbon cable (N5242-60008), A19 test set motherboard J203 to A36 port 4 source
attenuator
— Wire harness (part of the switch assembly), A19 test set motherboard J103 to A48 port 4
source bypass switch
Step 24.Disassemble the 2-Port Front Panel and Assemble the 4-Port Front
Panel
Before the front frame can be replaced, the items making up the back side of the front panel
assembly must be removed. For instructions on removing these items, click the Chapter 7
bookmark "Removing and Replacing the A1-A3 and Other Front Panel Subassemblies" in the PDF
1
Service Guide
. New parts are listed in
1. In the section "Removing the A2 USB Board," perform step 1 (the only step).
2. In the section "Removing the A1 Front Panel Interface Board and Keypad Assembly", perform
steps 1 - 5.
"Downloading the Online PNA Service Guide" on page 5
1. See
Installation Note N5242-90017
1
.
Follow instructions carefully when making cable connections, especially
wire harness connections. Incorrect connections can destroy components,
resulting in additional customer costs.
7.
Table 1 on page
Installation Procedure for the Upgrade
1
.
7.
.
1
. New parts
36
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